Concave Pixel LED Layout for Uniform Display Light Emission
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Solution Overview
Problem
Display apparatuses using LEDs as point sources of light often suffer from low display quality due to visibility differences between regions near and far from the LED, leading to uneven light emission.
Innovation Solution
The display apparatus incorporates a substrate with an LED positioned above it, a pixel-defining layer with a concave portion to house the LED, a light guider to direct light emitted from the LED, and a light blocker to cover the LED, along with scattered particles and reflection patterns to enhance light distribution and uniformity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If an LED is used as a point source of light in a display apparatus, then the device structure is simple, but the display quality is poor due to visibility differences between regions near and far from the LED
Solution Approach 1:
The patent divides the light emission area into multiple segments by positioning multiple LEDs at different locations within the pixel-defining layer. Each LED serves as an independent light source, and their combined emission creates a more uniform overall illumination across the display region, resolving the visibility difference problem while maintaining structural simplicity
Solution Approach 2:
The patent applies local quality by positioning LEDs at specific locations within the pixel-defining layer rather than using a single centralized source. Each LED is strategically placed to illuminate specific regions, creating locally optimized light distribution that collectively achieves uniform overall illumination and improved display quality
2Device complexity
If the LED is positioned at the center of the pixel-defining layer, then the device structure is simple, but light distribution becomes uneven causing visibility differences
Solution Approach 1:
The patent employs asymmetry by deliberately positioning LEDs at non-central, asymmetric locations within the pixel-defining layer. This asymmetric arrangement optimizes light distribution across different regions of the display, preventing the visibility differences that would occur with centralized symmetric positioning while maintaining structural simplicity
3Device complexity
If the LED is exposed at the top surface, then the device structure is simple, but the LED appears as a point source reducing display quality
Solution Approach 1:
The patent applies the nesting principle by placing the LED within a concave portion of the pixel-defining layer rather than exposing it at the top surface. The LED is nested inside the pixel-defining structure, which conceals the point source appearance while allowing light to emit uniformly through the pixel-defining layer, thereby improving display quality without significantly complicating the device structure
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration effectively prevents the LED from appearing as a point source of light, ensuring uniform light emission and improved display quality by guiding and scattering light to reduce luminance variations across the display region.
Implementation Method 1
a light guider disposed in the space and between the LED and the pixel-defining layer, and guiding light emitted from the LED to a region adjacent to the second inner side surface of the concave portion
Implementation Method 2
a plurality of scattered particles may be distributed in the light guider
Implementation Method 3
reflection patterns may be disposed in a bottom portion of the concave portion
Implementation Method 4
a light blocker disposed above the pixel-defining layer to cover a top surface of the LED
Data Source
AI summary
A display apparatus includes: a substrate; a light-emitting diode (“LED”) disposed above the substrate; a pixel-defining layer disposed above the substrate and including a concave portion which defines a space in which the LED is disposed; a light guider disposed in the space and between the LED and a first inner side surface of the concave portion; and a light blocker disposed above the pixel-defining layer to cover a top portion of the LED. The LED is disposed a second inner side surface of the concave portion, which is opposite to the first inner side surface, and spaced apart from a center of the concave portion, and the light guider guides light emitted from the LED to a region adjacent to the second inner side surface of the concave portion.